refactor: remove terminal workspaces

[kitlangton]

What

Remove Terminal Control's built-in terminal multiplexer: persistent workspaces, attachment, windows, panes, layouts, tab chrome, and their CLI/MCP controls.

Terminal Control remains focused on terminal automation through:

• named background sessions with start, wait, send, show, save, logs, resize, restart, and stop
• human-visible foreground sessions with run
• isolated driver and TypeScript test sessions
• recording, rendering, semantic snapshots, and direct-session MCP tools

This removes roughly 12,000 lines and prepares a breaking 1.0.0 release.

How

• Delete src/workspace.rs, workspace benchmarks, attachment rendering, pane/window protocol variants, and workspace CLI/MCP schemas.
• Reduce src/session.rs to one PTY process per session while preserving buffered socket transport, bounded output pumping, secure pruning, TERMCTRL_SESSION, semantic snapshots, and atomic MCP screen/status reads.
• Keep foreground run cooperative: human input continues during agent waits, host responses come from the real terminal, terminal modes are restored on exit, and the child exit code is propagated.
• Keep direct-session save_screen; MCP discovery defaults to running sessions.
• Align README, agent skill, domain context, driver docs, Clap help, and repository guidance.

Scope

• PR feat: add deterministic tape playback and pointer-aware automation #18 must be rebased to retain direct-session tape/pointer work and drop workspace targets.
• PR fix: support Windows TUI control #16 remains useful for Windows named-session transport and should be rebased after this lands.
• Issues feat: start and stop recording on live sessions #5, feat: filter and prune retained sessions #6, feat: expose evidence capture and recording through MCP #7, and fix: encode MCP shiftTab as terminal back-tab #9 remain open follow-up work.
• The npm scope migration in Plan npm scope migration to @anomalyco #3 remains separate.

Testing

• bun install --frozen-lockfile
• cargo fmt --all -- --check
• cargo test --all-targets (106 passed, 1 ignored)
• cargo clippy --all-targets --all-features -- -D warnings
• cargo build --release
• bun run test:npm (12 client tests, 9 OpenTUI adapter tests)
• bun run build:npm
• bun run validate:npm
• cargo package --list --allow-dirty
• cargo package --allow-dirty
• cargo publish --dry-run --locked --allow-dirty
• Live background start / show / status / stop session
• Live TERMCTRL_SESSION checks for background and foreground sessions
• Live nested disposable-session identity isolation
• Live foreground child exit-code propagation
• Live concurrent agent wait plus human terminal input

Demo

The reduced CLI exposes sessions without workspace commands:

start  run  wait  send  status  list  prune  resize
mark   markers  logs  restart  stop  show  save  video

$ termctrl run exit-smoke -- sh -c 'exit 7'
$ echo $?
7

Flow

sequenceDiagram
    participant Human as Human terminal
    participant CLI as termctrl run
    participant Session as Single PTY session
    participant Agent as CLI / MCP agent

    Human->>CLI: run NAME -- COMMAND
    CLI->>Session: start one PTY process
    Session-->>Human: mirror terminal output
    Agent->>Session: wait / send / show / save
    Human->>Session: terminal input remains live
    Session-->>CLI: child exit status
    CLI-->>Human: restore terminal and propagate exit code

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